A term refering to poor acting, specifically blank, emotionless expressions.
The term first appears in the Alien from L.A. episode of MST3K to refer to Kathy Ireland's general countenance.

Me: Dude, have you seen that Alien from L.A. film?
My friend: Yeah, man! Kathy Ireland's idea of acting seems to involve approaching all emotions with the same face dull surprise.
Me: I know what you mean. She's like a female Charlie Sheen